package com.atguigu.service;

import com.atguigu.entity.Admin;
import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

@Component
public class UserDetailServiceImpl  implements UserDetailsService {

    @DubboReference
    private AdminService adminService;

    @DubboReference
    private PermissionService permissionService;
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        // 根据用户名查询登录的用户
        Admin admin =adminService.getByUsername(username);
        if(null == admin){
            throw  new UsernameNotFoundException("用户名不存在!!");
        }
        // 获取用户的所有权限码
        List<String> codeList=  permissionService.findCodeListByAdminId(admin.getId());
        // 准备一个Collection,装simpleGrantedAuthority
        Collection<GrantedAuthority> authorities=new ArrayList<>();
        // 迭代codeList
        for (String code : codeList) {
            if(!StringUtils.isEmpty(code)){
                SimpleGrantedAuthority simpleGrantedAuthority = new SimpleGrantedAuthority(code);
                authorities.add(simpleGrantedAuthority);
            }
        }
        // 将登录的用户信息封装进入一个User(spring_security)对象
        User user =new User(username,admin.getPassword(),authorities);
        return user;
    }
}
